CHICAGO - City Hall is shaking from a series of corruption scandals, and Mayor Richard Daley's approval ratings are at historic lows. Add to that a possible mayoral hopeful — congressman Jesse Jackson Jr. — who won't let those scandals die, and the city that has been ruled by a Daley for 37 of the past 50 years has the potential for picking another name come 2007. So Daley has brought out the ax at City Hall, forcing out four department heads and accepting the retirement of a fifth connected to the scandals in the last six weeks. Political strategists...